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An improved version of the AC-13 was designed, known as the AC-14. A larger version of the AC-13, powered by a Turbomeca Artouste II shaft turbine and with accommodation for five.

The prototype AC.14 used part of the structure of one of the AC.13s but had a lengthened cabin section with a rear seating area and a larger 400shp Turbomeca Artouste IIB turboshaft engine. The engine is mounted above the cabin, which is extensively sound-proofed. Residual thrust is used to increase forward speed, and anti-torque control by gas deflection in helicopter flight and by vertical rudders in gyrodyne flight (high speed cruising).

The single, four-blade rotor has double-articulated blades with an area each 0.84sq.m, and total disc area of 72.35sq.m. The landing gear of of skid type with a 2.0m track.

The enclosed cabin seats a pilot at the front and four passengers in two side-by-side pairs behind. Entrance doors are on each side of cabin.

An initial series of six was completed in Madrid by ENHASA and the first flew on July 16, 1957.

Having provided funds for the Aerotecnica helicopter project, the Spanish Government ordered ten examples. These were delivered to the Spanish Air Force, with the designation EC-XZ-4, where they served for a relatively short period before being retired.